2 layers42.1 × 32.9 mm
4 layers100 × 100 mm
Wroom board
SinaKarvandi/PCB-Designs1Blue Pill PCB
- Size
- 100 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 91
- Pads
- 326
- Tracks, vias
- 661, 109
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 Dec 2024
- Updated
- 29 Apr 2026
Overview
Wroom board is an open-source printed circuit board by SinaKarvandi, from the SinaKarvandi/PCB-Designs repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 100 × 100 mm with 63 parts on 91 nets, routed with 661 tracks and 109 vias.
It is built around the 74AHCT245D, CP2104EK and ESP32-WROOM-32D, with the SI7021-A20-GM, USBLC6-2P6 and BC817 among its other parts. Its parts include 20 resistors, 16 capacitors, 6 ICs, 6 connectors and 4 diodes. It belongs with the ESP32 boards of this library.
Main components
10
74AHCT245D
SOIC-20-300mil-40℃~+125℃ 1 11ns@5.5V,50pF 4.5V~5.5V 74AHCT 8 80uA 8mA 8mA Bidirectional TTL-compatible CMOS Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, TransceiversCP2104EK
-- USB Conversion Modules ROHSSilicon LabsUSB Conversion Modules
ESP32-WROOM-32D
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
SI7021-A20-GM
DFN-6-EP(3x3)DFN-6-EP(3x3) Temperature and Humidity Sensor ROHSSilicon LabsTemperature And Humidity Sensor
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
BLM21PG221SH1
08051 220Ω@100MHz 2A 45mΩ ±25% 0805 Ferrite Beads ROHSMurataFerrite Beads
LL4148
LL-341 Independent 1V@10mA 200mA 4A 4ns 500mW 5uA@75V 75V LL-34 Switching Diodes ROHSMDDSwitching Diodes
RT314A05
插件-40℃~+85℃ 10ms 10ms 16A 400V@AC 5V AgNi One set changeover: 1C (SPDT - changeover) Single Coil 插件 Magnetic Latching Relays ROHSTE ConnectivityMagnetic Latching Relays
UMH3N
SOT-363-55℃~+150℃ 0.5uA 100 100mA 150mW 2 NPN (Pre-Biased) 250MHz 300mV 50V 5V 6.11kΩ NPN SOT-363 Digital Transistors ROHSJiangsu Changjing Electronics Technology (CJ)Digital Transistors
README
README.mdPCB Designs
My random PCB designs using KiCad.
-
Blue Pill Board
Custom PCB design for STM32 "Blue Pill" development board.
-
ESP32-S3 Board
Schematic and layout for ESP32-S3-based design.
-
ESP32 WROOM Board
PCB based on ESP32-WROOM module.
-
LED Blinker
Simple circuit for testing LEDs and basic PCB workflow.
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100n | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C2, C6, C10, C12, C14, C15, C16 |
| 6 | 1K | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R6, R8, R9, R10, R16, R17 |
| 6 | 22R | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R4, R5, R18, R19, R20, R21 |
| 6 | 22u | Capacitor_SMD:C_0805_2012Metric | C4, C5, C8, C9, C11, C17 |
| 4 | 10K | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R3, R7, R14, R15 |
| 4 | Hole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 2 | 4K7 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R11, R12 |
| 2 | 4u7 | Capacitor_SMD:C_0805_2012Metric | C3, C7 |
| 2 | 5K1 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R2 |
| 1 | 1000u/25V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C1 |
| 1 | 74AHCT245 | Package_DIP:DIP-20_W7.62mm | U5 |
| 1 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | BLM21PG221 | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | FB1 |
| 1 | CP2104 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U3 |
| 1 | Conn_01x04_Pin | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J2 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J6 |
| 1 | ESP32-WROOM-32D | RF_Module:ESP32-WROOM-32D | U1 |
| 1 | Fuse | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | GREEN | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | LED_RGBA | LED_SMD:LED_RGB_Wuerth-PLCC4_3.2x2.8mm_150141M173100 | D3 |
| 1 | LL4148 | Diode_SMD:D_MiniMELF | D1 |
| 1 | Polyfuse_1Amp | Fuse:Fuse_1206_3216Metric | F2 |
| 1 | RT314A05 | Relay_THT:Relay_SPDT_Schrack-RT1-16A-FormC_RM5mm | K1 |
| 1 | SW_SPST | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KMR2 | SW1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J5 |
| 1 | Screw_Terminal_01x03 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-3-3-5.08_1x03_P5.08mm_Horizontal | J3 |
| 1 | Screw_Terminal_01x08 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-8-5.08_1x08_P5.08mm_Horizontal | J4 |
| 1 | Si7021-A20 | Package_DFN_QFN:DFN-6-1EP_3x3mm_P1mm_EP1.5x2.4mm | U4 |
| 1 | TLV1117LV-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U6 |
| 1 | UMH3N | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | YELLOW | LED_SMD:LED_0603_1608Metric | D2 |
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Questions
How big is the Wroom board PCB?
It measures 100 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Wroom board use?
63 parts, built around the 74AHCT245D, CP2104EK, ESP32-WROOM-32D and SI7021-A20-GM. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Wroom board KiCad files?
From the SinaKarvandi/PCB-Designs repository on GitHub, at the commit this page was made from: the board is wroom_board/wroom_board.kicad_pcb and its schematic bluepill_board/bluepill_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wroom board design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).